- Female patients must not be pregnant or breast-feeding. Female patients of childbearing potential (defined as >2 years after last menstruation or surgically sterile) must use a highly effective contraceptive method (allowed methods of birth control, i.e. with a failure rate of less than 1% per year, are implants, injectables, combined oral contraceptives, intra-uterine device [IUD; only hormonspirals], sexual abstinence or vasectomized partner) during the trial and for a period of at least 6 months following the last administration of trial drug(s).Female patients with an intact uterus (unless amenorrhoeic for the last 24 months) must have a negative serum pregnancy test within 7 days prior to randomization into the trial